Question

why is prime meridian not an ideal prime line

Answer 1

Answer:

because the Earth is not perfectly round and local gravitational forces vary with terrain, the surface of the mercury at Greenwich was not precisely horizontal relative to the centre of the Earth's mass. As a result, the vertical line to the stars and therefore the meridian line on the ground were slightly skewed

Explanation:

pls mark me as the brainiest

Answer 2

Answer:

A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides a spheroid into two hemispheres. If one uses directions of East and West from a defined prime meridian, then they can be called the Eastern Hemisphere and the Western Hemisphere.